(a kákán is csomót keres - what's the proper English version for that?)

In Portuguese one might say "procurando pelo em casca de ovo" (looking for hairs on an eggshell).

You have that expression too! "Buscandole un pelo al huevo" would be the Spanish phrasing.On the other hand, ever does not invalidate "Dup/BJ/Zak". Ever invalidates a temporal reference, not a situational one...